围岩松动圈的弹塑性位移反分析方法探索  

A BACK ANALYSIS METHOD FOR ELASTOPLASTIC DISPLACEMENT OF BROKEN ROCK ZONE AROUND TUNNEL

作　　者：李宁[1] 段小强[1] 陈方方[2] 袁继国[1] 

机构地区：[1]西安理工大学岩土工程研究所,陕西西安710048 [2]西安科技大学,陕西西安710054

出　　处：《岩石力学与工程学报》2006年第7期1304-1308,共5页Chinese Journal of Rock Mechanics and Engineering

摘　　要：在按弹塑性理论进行地下工程设计与分析时,真实工作状态下岩体力学参数的确定十分重要和必要。为确定这些岩体力学参数,从洞室监测过程中的实际情况出发,根据掌子面的推进过程与监测位移间的变化情况,将监测位移进行弹塑性分离,从而提出一种行之有效、易于工程实际操作的考虑围岩松动圈的弹塑性位移反分析方法。该反分析方法所得结果与设定值吻合良好,并通过工程实例得到验证,为工程实践提供一个切实可行的实施方案以确定这些有用的参数,是岩土工程信息化设计、施工的重要手段。The rock around tunnel is usually loosed by blasting excavation behaviors. The nonlinear plastic properties in the loose area influence greatly the measurements of tunnel deformation. A new back analysis method is proposed based on the simulation of construction sequence step by step. The measured displacement is divided into elastic and plastic parts according to the different tunneling states. A back analysis method for the elastoplastic displacements of broken rock zone around tunnel is proposed based on the measured plastic deformations. An example shows that the proposed back analysis method is reliable and useful for tunnel engineering.

关 键 词：岩石力学 围岩变形监测 松动圈 位移反分析 

分 类 号：TU45[建筑科学—岩土工程]